Magnetoelasticity of Tb0.3Dy0.7Fe1.95 alloys in a multiaxial stress-magnetic field space

The simultaneous measurements of magnetization and magnetostriction have been carried out for Tb0.3Dy0.7Fe1.95 alloys subjected to the multiaxially magnetomechanical loading. The saturated magnetization and magnetostriction both decrease with the increase of the angle between the applied stress and magnetic filed. The magnetostriction goes up to a climax and then decreases as the applied magnetic field increases, which should remain saturated in the case of the specimen only subjected to the axial magnetic field. On the other hand, magnetization reaches saturation without any decrease in the same region of multiaxial magnetic-stress space. The unsaturated magnetostriction can be explained well by the magnetoelastic anisotropy. Such an investigation is important to validate theoretical approaches on the magnetomechanical behavior of giant magnetostrictive materials. (C) 2007 American Institute of Physics.